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In the next patch, the rmap btree repair code will need to estimate the size of the new ondisk rmapbt. The size is a function of the number of records that will be written to disk, and the size of the recordset is the number of observations made while scanning the filesystem plus the number of OWN_AG records that will be injected into the rmap btree. OWN_AG rmap records track the free space btrees, the AGFL, and the new rmap btree itself. The repair tool uses a bitmap to record the space used for all four structures, which is why we need a function to count the number of set regions. A reviewer requested that this be pulled into a separate patch with its own justification, so here it is. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de>
67 lines
2.5 KiB
C
67 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2018-2023 Oracle. All Rights Reserved.
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* Author: Darrick J. Wong <djwong@kernel.org>
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*/
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#ifndef __XFS_SCRUB_BITMAP_H__
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#define __XFS_SCRUB_BITMAP_H__
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/* u64 bitmap */
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struct xbitmap64 {
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struct rb_root_cached xb_root;
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};
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void xbitmap64_init(struct xbitmap64 *bitmap);
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void xbitmap64_destroy(struct xbitmap64 *bitmap);
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int xbitmap64_clear(struct xbitmap64 *bitmap, uint64_t start, uint64_t len);
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int xbitmap64_set(struct xbitmap64 *bitmap, uint64_t start, uint64_t len);
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int xbitmap64_disunion(struct xbitmap64 *bitmap, struct xbitmap64 *sub);
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uint64_t xbitmap64_hweight(struct xbitmap64 *bitmap);
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/*
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* Return codes for the bitmap iterator functions are 0 to continue iterating,
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* and non-zero to stop iterating. Any non-zero value will be passed up to the
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* iteration caller. The special value -ECANCELED can be used to stop
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* iteration, because neither bitmap iterator ever generates that error code on
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* its own. Callers must not modify the bitmap while walking it.
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*/
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typedef int (*xbitmap64_walk_fn)(uint64_t start, uint64_t len, void *priv);
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int xbitmap64_walk(struct xbitmap64 *bitmap, xbitmap64_walk_fn fn,
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void *priv);
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bool xbitmap64_empty(struct xbitmap64 *bitmap);
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bool xbitmap64_test(struct xbitmap64 *bitmap, uint64_t start, uint64_t *len);
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/* u32 bitmap */
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struct xbitmap32 {
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struct rb_root_cached xb_root;
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};
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void xbitmap32_init(struct xbitmap32 *bitmap);
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void xbitmap32_destroy(struct xbitmap32 *bitmap);
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int xbitmap32_clear(struct xbitmap32 *bitmap, uint32_t start, uint32_t len);
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int xbitmap32_set(struct xbitmap32 *bitmap, uint32_t start, uint32_t len);
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int xbitmap32_disunion(struct xbitmap32 *bitmap, struct xbitmap32 *sub);
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uint32_t xbitmap32_hweight(struct xbitmap32 *bitmap);
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/*
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* Return codes for the bitmap iterator functions are 0 to continue iterating,
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* and non-zero to stop iterating. Any non-zero value will be passed up to the
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* iteration caller. The special value -ECANCELED can be used to stop
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* iteration, because neither bitmap iterator ever generates that error code on
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* its own. Callers must not modify the bitmap while walking it.
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*/
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typedef int (*xbitmap32_walk_fn)(uint32_t start, uint32_t len, void *priv);
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int xbitmap32_walk(struct xbitmap32 *bitmap, xbitmap32_walk_fn fn,
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void *priv);
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bool xbitmap32_empty(struct xbitmap32 *bitmap);
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bool xbitmap32_test(struct xbitmap32 *bitmap, uint32_t start, uint32_t *len);
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uint32_t xbitmap32_count_set_regions(struct xbitmap32 *bitmap);
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#endif /* __XFS_SCRUB_BITMAP_H__ */
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